People in power look at the direction of the popular opinion. Really they put themselves at the mercy of the population. Democracy means from the bottom up. Autocracy means from top down. If you can capture the interest of the common man, then those on the top will have to cater to that interest in order to get their post. Capture a brilliant man by capturing first a thousand lunk heads. Preaching means tactical. We have to see which tactic is going to bring us the advantage.